BoilerFaultCodes Fault on Fan or Flue High
Boiler Fault Code Fault on Fan or Flue
Also written as FAULTONFANORFLUE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fault on Fan or Flue appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to breathe safely, meaning it cannot clear away exhaust gases effectively and has shut down to prevent any risk. (As reported on Potterton Performa 28i)
Pick your boiler brand for the Fault on Fan or Flue fix
Source
Information for the Fault on Fan or Flue fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026